I installed it first right from the water source which is where they recommend. Some of the booster pumps say they are not for use after the membrane. They need pressure to work and then just boost it. They recommend a different type of pump for just moving the water after the membrane instead of boosting the pressure before. I would get 38-40 psi but as the first filter got dirty my pressure would drop to 35 at the membrane. Now it makes no difference I get 90psi all the time. BRS put out a video showing how good a membrane functions as far as water production and efficiency of removing solids at pressures I think from 30psi up to 90. I really recommend watching it if your thinking about a booster because you can decide if you think it’s worth it. I think at 50 or 60 psi you get full efficiency of the membrane and after that you just produce water faster. Like I said I make water crazy fast now.